linux-kernel - Re: [PATCH 7/7] perf tools: add feature header record to pipe-mode

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Date:   Thu, 18 May 2017 18:13:41 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     David Carrillo-Cisneros <davidcc@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
        He Kuang <hekuang@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH 7/7] perf tools: add feature header record to pipe-mode

On Wed, May 17, 2017 at 09:16:02PM -0700, David Carrillo-Cisneros wrote:

SNIP

> -		(*p)->offset = lseek(fd->fd, 0, SEEK_CUR);
> +		(*p)->offset = lseek(fdd->fd, 0, SEEK_CUR);
>  
> -		err = feat_ops[type].write(fd, evlist);
> +		err = feat_ops[type].write(fdd, evlist);
>  		if (err < 0) {
>  			pr_debug("failed to write feature %s\n", feat_ops[type].name);
>  
>  			/* undo anything written */
> -			lseek(fd->fd, (*p)->offset, SEEK_SET);
> +			lseek(fdd->fd, (*p)->offset, SEEK_SET);
>  
>  			return -1;
>  		}
> -		(*p)->size = lseek(fd->fd, 0, SEEK_CUR) - (*p)->offset;
> +		(*p)->size = lseek(fdd->fd, 0, SEEK_CUR) - (*p)->offset;
>  		(*p)++;
>  	}
>  	return ret;
> @@ -2261,10 +2301,6 @@ static int perf_header__adds_write(struct perf_header *header,
>  	int feat;
>  	int err;
>  
> -	/*
> -	 * may write more than needed due to dropped feature, but
> -	 * this is okay, reader will skip the mising entries
> -	 */

you added this comment in earlier patch, if you don't want it,
remove it in the original patch

jirka